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CHAPTER 2
UNIT DESCRIPTION AND OPERATION
SECTION I. UNIT
2-1. GENERAL
The TI4100GPU-24 (Turbo Start 4100) (Figure 2-1 and 2-2) is a compact, por-
table and highly versatile 24/28.5 VDC electrical ground power unit. The
unit incorporates a 208-240 single phase VAC to 28.5 VDC converter, a 24 volt
unique (dry) power cell and an internal intelligent 208 to 240 volt AC
charger to recharge the power cells. These built-in features give the Turbo
Start 4100 self-sufficiency and mobility for short-term operations without AC
electrical power or long term operations with AC electrical power. Short
term operations rely solely on power cell output and the fast recharge rates
that the unit’s internal charger provides from any standard 208-240 single
phase VAC electrical outlet. Longer term operations incorporate the continu-
ous 100 amp output of the 208-240 VAC to 28.5 VDC converter, or a combination
of converter and power cell output to provide 24 VDC output. The following
are the unit’s four (4) main operational support capabilities:
a. 24 VDC 1500 amp peak power output for engine starting or constant (one
hour) rated power output (without a 208-240 VAC power source) for short term
trouble shooting and flexible flight line support ground power.
b. 24 VDC constant (one hour) rated power output or variable high load de-
mand output (less than one hour) with a 208-240 single phase VAC power source
for extended maintenance (hangar) and routine flight line maintenance, ground
support power.
c. 28.5 VDC continuous rated (AC to DC converter) power output with a 208-
240 VAC power source for hangar and routine flight line maintenance support,
and avionics bench testing.
d. Rapid recharge of the unit’s power cells from any 208-240 VAC common
power source. This feature eliminates the need for special recharge equip-
ment and dedicated maintenance support man-hours.
2-1